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Momentum
Question regarding stack/reach/head tube length.
I’m riding a 58 supersix, which fits very well, 120 -6 slammed, but I’m sizing up a TCR. Looks like I could ride an ML TCR with Shimano 12s shifters, which are longer reach, on a 120 stem, but I’d need 20mm spacers under the stem. TCR in L would need a 110 stem but slammed.
What I don’t get is the relationship between stack and head tube lengths. They don’t add up, especially as the TCR has tyre clearance for 32mm, vs 28mm on the supersix. So the fork length should be longer, making the head tubes shorter to match these stack measurements, right?
If the L TCR has 10mm taller head tube, plus clearance for 32s, how can the stack be 3mm lower?